Power System Static Voltage Stability Analysis

The voltage stability and voltage collapse is an important direction of electric powersystems research in recent decades. Large area have not electricity supply is often happen athome and abroad, cause huge economic loss, property loss and social influence. It is thoughtto be the problems to be solved.This topic generally summarized background and current study situation of powersystem static voltage stability. Describe meaning of the electric power system static voltagestability research. The electrostatic voltage analysis is to identify the limit of the voltagestability, there are many algorithms have problems about no convergence near inflectionpoint, this topic improve the traditional continuous flow algorithm, at the conclusion of thestudy based on the before work, overcome the problem of conventional flow jacobianmatrix do not convergence. Introduced the current static voltage stability analysis used inthe characteristics of load model. Through the PV curve of different load characteristicsanalysis the influence of static voltage stability. Introduces a typical load model of ZIP loadmodel. Using an improved continuous flow method analysis ZIP load of differentquantitative, compared simulation results between with the constant impedance load model,constant current load model and constant power load model. For improving system voltagelevel, prevent the voltage stability, we adopt the method of install the voltage stabilizer onAVR. In the simulation analysis, we can clearly see PSS can effectively increase thedamping, restrain low frequency oscillation. And at the same time, we also change PSSparameters to analysis the affect comparing with different parameters of the PSS. Based onthe new power system analysis tools PSAT test model established simulation. The resultsshow that PSS can effectively increase the damping, restrain the low frequency oscillation.It provides a improve mean for electric power system voltage stability.In addition, This subject is summarized how to improve the power system voltagestability; has certain reference value to power system planning and operation.